Road Surface Treatments Association

Steel mesh case histories

Richard BennettMaccaferri

www.rsta-uk.org

SteelmeshSteelmesh

• Over 100 installations in UK since 2005Over 100 installations in UK since 2005• Over 300 installations worldwide• Extreme sites• Extreme sites

– Soft ground– Extreme temperatures– Extreme temperatures – Widening – High wheel loadHigh wheel load

• Junctions• Bus/ Crawler lanes

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SteelmeshSteelmesh

Reinforcing bar

Double twistedwire mesh

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SteelmeshSteelmesh

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Steel mesh interlockSteel mesh interlock

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Installation – Unrolling and t t histretching

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Installation – Rolling with PTRInstallation Rolling with PTR

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Installation – NailingInstallation Nailing

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Installation – Slurry sealInstallation Slurry seal

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Installation – BlindingInstallation Blinding

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Installation – PavingInstallation Paving

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Installation – ProblemsInstallation Problems

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A4144, Abingdon Road, Oxford

• Heavily traficked section on alluvium, low CBRFi d k b h i ht

A4144, Abingdon Road, Oxford

• Fixed kerb height• Shallow services• Norman causeway

• Required constant maintenance for fatigue cracking• Resurfaced in 2003

• Geogrids in the sub-base • Steel mesh nailed overlain by 260mm HDM

• No fatigue cracking after 8 yearsNo fatigue cracking after 8 years

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A507, Ampthill Bypass, Bedfordshire

• Heavily trafficked bypass

A507, Ampthill Bypass, Bedfordshire

• Resurfaced in 2001• 80mm overlay

• No return of cracking after 10 yearsNo return of cracking after 10 years

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A157, Orby Bypass, Lincolnshire

• Soft ground

A157, Orby Bypass, Lincolnshire

• Constructed in 2005• 100mm overlay

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State route, 453 Blair County, P l i USA Pennsylvania, USA

• Reflection cracks from rocking concrete slabsReflection cracks from rocking concrete slabs– Grouted, steel mesh and 60mm overlay in 2002

No return of cracking in 9 years– No return of cracking in 9 years

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B7052, Whauphill, Dumfries and G llGalloway

• Quarry roadQuarry road

• 1.6km section on peatR i d M thl i t– Required Monthly maintenance

– Cracking and potholes

• Resurfaced in 2003– No maintenance in 11 years

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Steel mesh installations

– A167 Durham, 1997

Steel mesh installations

• HA trial on old section of A1

– A631 Shepcote Lane, 2005• New heavy traffic to steelworks

– Moss roads Lancashire, 1991,• 50km of roads on peat

– A9 Daviot, 2001A9 Daviot, 2001• 4km Soft ground

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B873, Sutherland

• Floating roads trial

B873, Sutherland

• Peat• Differential settlement• Expensive to excavate or pile• Wetting and drying cyclee g a d d y g cyc e• Avoid disturbing the equilibrium

• Geogrid in the sub-base reduces weightGeogrid in the sub base reduces weight• Steel mesh in the asphalt controls

crackingcracking

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B873, Floating road trialsB873, Floating road trials

• Constructed in 1995Constructed in 1995

• http://www.roadex.org

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A75, Dumfries and Galloway

• Truck route links Stranraer with M74

A75, Dumfries and Galloway

• Poorly drained section east of Newton Stewart• Required constant maintenance during 80’ and 90’s• Resurfaced in 1999• Resurfaced in 1999

• Regulating layer, • Steel mesh

80 l• 80mm overlay

• No cracking after 11 years

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Road Surface Treatments Association

Thank you

Richard BennettMaccaferri

www.rsta-uk.org